Translation: Cuantas lenguas hablas?
No, it is not considered rude to speak Spanish in Portugal. Many Portuguese people understand and speak Spanish, as the two languages are similar. However, it is always polite to ask if the person you are speaking to is comfortable with Spanish or if they would prefer to communicate in Portuguese.
To ask "What languages do you speak?" in French, you would say "Quelles langues parlez-vous?"
it's Spanish you should ask what is the language used by Spaniards.
She speaks french, and spanish
You will most likely have to speak Spanish to be understood. If your Mexican interlocutor is cultured, he/she may understand your English, but you should ask first: 'Habla Ingles?' (Spanish for 'Do you speak English?').
who knows. thoughout time the language developed and nobody ever recorded which gender was the first to speak spanish...you might as well ask how many stars there are in the sky...
¿Cuántos?
if you are referring to the wiki-answer site, it is used by many people in many countries who speak other languages besides English, this site is not just used in the USA, so there are many people on this site who are able to ask and answer questions in many languages which is a wonderful opportunity to interact with other cultures, races and people in general.
In Spanish, "my uncle" is translated as "mi tío." If you need translations in other languages or contexts, feel free to ask!
If you are able to, it's a good way to practice the language. But you should ask the person in English first, as a courtesy, if it is all right.
"en voz más alta, por favor" = more loudly, please
I don't believe Caucasians speak any other language but english or any european language. A caucasian can be a mix between a European ethnicity and "Indo-European". You can tell a little bit if a person is Caucasian by their curly or wavy hair and light or slightly tan skin. But its respectful to ask first. :)